61277687811 has 16 divisors (see below), whose sum is σ = 90940769920. Its totient is φ = 40780237320.

The previous prime is 61277687771. The next prime is 61277687827. The reversal of 61277687811 is 11878677216.

61277687811 is a `hidden beast` number, since 612 + 7 + 7 + 6 + 8 + 7 + 8 + 11 = 666.

It is not a de Polignac number, because 61277687811 - 2²² = 61273493507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61277682811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1971925 + ... + 2002758.

It is an arithmetic number, because the mean of its divisors is an integer number (5683798120).

Almost surely, 2^61277687811 is an apocalyptic number.

61277687811 is a deficient number, since it is larger than the sum of its proper divisors (29663082109).

61277687811 is a wasteful number, since it uses less digits than its factorization.

61277687811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3975263 (or 3975257 counting only the distinct ones).

The product of its digits is 1580544, while the sum is 54.

The spelling of 61277687811 in words is "sixty-one billion, two hundred seventy-seven million, six hundred eighty-seven thousand, eight hundred eleven".